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• S = 0.25(185 ft)(1220 ft .+ 1360 ft + 1640 ft) <br />2,774,000 ft <br />S = 0.070 <br />Slope adjustment factor = 1.18 (Appendix E, SCS, 1980) <br />Hydraulic Length = 3120 ft <br />Equivalent watershed area = 90.5 acres (Appendix E, <br />SCS, 1980) <br />For a CN of 69, <br />~ 49 cfs/in. (64 acres / 35 cfs/in. <br />`90.5 acres/ <br />• 35 cfs/in.(0.07 in.)(1.18) = 2.9 cfs. <br />n <br />U <br />10 <br />